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cve recordhigh

CVE-2026-14456

Published
CVSS7.5
Severityhigh
WeaknessCWE-770
ExploitedNot in CISA KEV

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

Issue summary: When an OpenSSL QUIC server (Listener SSL object) processes valid QUIC Initial packets for unknown destination connection IDs, it can allocate and queue new incoming channels without enforcing any limit. Impact summary: A remote peer that can make many Initial packets reach the server listener faster than the application accepts connections, can cause the memory allocated to store the per-channel state to grow without any limits, potentially making the QUIC listener unavailable and causing Denial of Service. CWE: CWE-770: Allocation of Resources Without Limits or Throttling Description: The function that handles inbound QUIC packets uses Connection-Id from the packet header

References

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Our coverage of CVE-2026-14456

CVE-2026-14456high

CDN Tsunami Attack Abuses HTTP/3 Translation for Up to 350x DoS Amplification

Researchers have identified two denial-of-service (DoS) attack methods, dubbed "CDN Tsunami," that exploit the translation process between HTTP/3 and HTTP/1.1 used by major content delivery networks. These attacks can amplify low-bandwidth requests into significant loads on origin servers, with amplification factors up to 350x observed on some CDNs. The vulnerabilities affect services like Alibaba, Baidu, Cloudflare, Amazon CloudFront, Fastly, and Tencent, though mitigation strategies are being developed and deployed by some vendors.